菜鸟学计算机英语

从简单词汇开始理解ERWin:Attribute, Entity, Logical Model, Physical Model, Domain, Cardinality

Categories: Development Notes; Tagged with: ERwin • SQL • 菜鸟学计算机英语; @ November 17th, 2008 23:04

1. Attribute : [普] 属性, 品质, 特征

Represents[表现,描绘] a type of characteristic or property with a set of real or abstract things(People, Places, Events and so on);
个人理解: Attribute对应着数据库中的Column, 对应OOP中的Propertie

2. Entity: [普] 实体

An Entity represents a set of real or abstract things(People, Places, Event and so on) that have common attributes or characteristics.
个人理解: Entity对应着数据库中的Table, 在OOP端, 则对应着一个Class.

3. Logic Model\Physical Model: [普] 逻辑模型\物理模型

由于数据库厂商实在太多, 如MS SQL, MySQL, DB2, Oracle等, 在DataType, SQL语句, 命名原则方面, 各有不同,
在设计数据库时也许要考虑到日后数据库的更换, 着眼于长远,我们需要设计一个与具体厂商无关的Model,, 这便是Logic Model.

同时又需要设计一个具体的Model, 这个Model直接与某个厂商某个数据库版本相适应, 这便是Physical Model

4. Domain, Cardinality

…待续…

E-Mail最常用的100种句型[1—22]

Categories: Development Notes; Tagged with: E-Mail • 菜鸟学计算机英语; @ November 16th, 2008 10:45

摘自: <<进了外企再学英语>>

Starting:

1. I am writing to confirm/enquire/inform you….
确认/询问/通知
2. I am writing to follow up on our earlier decision on the marketing campaign in Q2
我写信来追踪先前我们对于第二季度营销活动的决定.

Starting a reference

3. With reference to our telephone conversation today…
4. In my previous e-mail on October 5…
5. As I metioned earlier about…
6. As indicated in my previous e-mail…
7. As we discussed on the phone…
8.From our decision at the previous meeting…
9. As you requested/Per your requirement…按照你的要求
10. In reply to your e-mail dated April 1, we decided…
11. This is in response to your e-mail today.
12. As mentioned before, we deem this product has strong unique selling points in China.
13. As a follow-up to our phone conversation yesterday, I wanted to get back to you about the pending issues of our agreement. Pending:未解决的.
14. I received your voice message regarding the subject. I’m wondering if you can elaborate i.e.provide more details.
elaborate
adj.
精心制作的, 详细阐述的, 精细
vt.
精心制作, 详细阐述
v.
详细描述

Giving infomation

15. Please be advised/informed that…
16. Please note that..
17. We would like to inform you that…
18. I am convinced that…
19. We agree with you on …
20. With effect from 4 Oct.,2008…从2008年10月4日开始生效
21. We will have a meeting scheduled as noted below…
22. Be assured that individual statistics are not disclosed and this is for internal use only.